A mains electricity (AC-powered) device with special lamps that emit ultraviolet B (UVB), or UVB and ultraviolet A (UVA) radiation intended to treat a variety of dermatological disorders (e.g., psoriasis). The device is typically designed as a flat surface for lying with an overhead lamp(s), or as a chamber/cabinet, in which the patient stands, with interior walls lined with ultraviolet (UV) light tubes to allow full-body exposure and an even distribution of UV radiation. The device intended use may include psoralen + UVA therapy (oral administration of psoralen and subsequent exposure to UVA) (PUVA).